US4711285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-performance pneumatic tire having bead fillers of anisotropic elasticity
Assignee: Bridgestone Corp
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Filing: 1985-07-10
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Granted: 1987-12-08
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Expires: 2005-07-10
Abstract
Abstract Disclosed is a high-performance tire in which a bead filler formed of a rubber composition fills up a space between each turn-up portion of the carcass and a major portion of the carcass and extends to some extent along the carcass toward the tread. The rubber composition is anisotropic such that the elastic modulus in the direction circumferential of the tire is distinctly higher than in the direction radial of the tire. Such anisotropy can be produced by incorporating short fiber of a suitable thermoplastic polymer such as nylon into the rubber composition. This tire provides both improved controllability and a good ride.
Inventors
- 👤 Masaki Ogawa
- 👤 Takabumi Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:45
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10513; Y10T152/10819; Y10T152/10846
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
220 words
A high-performance pneumatic tire comprising: a tread; side walls; a carcass which comprises layers of rubberized cords laid parallel and is wrapped around a bead in each edge portion thereof so as to provide a turn-up portion; and a bead filler for each bead, which fills up a space between the turn-up portion of the carcass and a major portion of the carcass and extends along the outer side of the carcass toward the tread, each bead filler comprising a rubber composition which comprises about 100 parts by weight of a rubber component and from about 15 to 70 parts by weight of short fiber filaments having a mean diameter of less than about 1 μm wherein the material of said short fiber filaments comprises a thermoplastic polymer, said fibers being oriented to an extent sufficient so that the rubber composition is anisotropic to a degree that the modulus of elasticity of the bead filler measured under tension in the circumferential direction of the tire to the extent of about 20% stretch is greater than about 40 kg/cm 2 and is in a range of between about 2 and about 6 times as high as the modulus of elasticity of said bead filler measured under tension in the radial direction of the tire to the extent of about 20% stretch.
Claim 2
Dependent Claim
220 words
A high-performance pneumatic tire comprising: a tread; side walls; a carcass which comprises layers of rubberized cords laid parallel and is wrapped around a bead in each edge portion thereof so as to provide a turn-up portion; and a bead filler for each bead, which fills up a space between the turn-up portion of the carcass and a major portion of the carcass and extends along the outer side of the carcass toward the tread, each bead filler comprising a rubber composition which comprises about 100 parts by weight of a rubber component and from about 15 to 70 parts by weight of short fiber filaments having a mean diameter of less than about 1 μm wherein the material of said short fiber filaments comprises a thermoplastic polymer, said fibers being oriented to an extent sufficient so that the rubber composition is anisotropic to a degree that the modulus of elasticity of the bead filler measured under tension in the circumferential direction of the tire to the extent of about 20% stretch is greater than about 40 kg/cm 2 and is in a range of between about 2 and about 6 times as high as the modulus of elasticity of said bead filler measured under tension in the radial direction of the tire to the extent of about 20% stretch.
Claim 3
Dependent Claim
17 words
A tire according to claim 1, wherein the material of said short fiber filaments comprise syndiotactic 1,2-polybutadiene.
Claim 4
Dependent Claim
17 words
A tire according to claim 1, wherein the material of said short fiber filaments comprise isotactic polypropylene.
Claim 5
Dependent Claim
218 words
A high-performance pneumatic tire comprising: a tread; side walls; a carcass which comprises layers of rubberized cords laid parallel and is wrapped around a bead in each edge portion thereof so as to provide a turn-up portion; and a bead filler for each bead, which fills up a space between the turn-up portion of the carcass and a major portion of the carcass and extends along the outer side of the carcass toward the tread, each bead filler comprising a rubber composition which comprises about 100 parts by weight of a rubber component and from about 15 to 70 parts by weight of short fiber filaments having a mean diameter of less than about 1 μm wherein the material of said short fiber filaments comprises a thermoplastic polymer having an acid amide bond represented by the formula: ##STR2## said rubber composition being anisotropic such that the modulus of elasticity of the bead filler measured under tension in the circumferential direction of the tire to the extent of about 20% stretch is greater than about 40 kg/cm 2 and is in a range of between about 2.0 and about 6.0 times as high as the modulus of elasticity of said bead filler measured under tension in the radial direction of the tire to the extent of about 20% stretch.
Claim 6
Dependent Claim
218 words
A high-performance pneumatic tire comprising: a tread; side walls; a carcass which comprises layers of rubberized cords laid parallel and is wrapped around a bead in each edge portion thereof so as to provide a turn-up portion; and a bead filler for each bead, which fills up a space between the turn-up portion of the carcass and a major portion of the carcass and extends along the outer side of the carcass toward the tread, each bead filler comprising a rubber composition which comprises about 100 parts by weight of a rubber component and from about 15 to 70 parts by weight of short fiber filaments having a mean diameter of less than about 1 μm wherein the material of said short fiber filaments comprises a thermoplastic polymer having an acid amide bond represented by the formula: ##STR2## said rubber composition being anisotropic such that the modulus of elasticity of the bead filler measured under tension in the circumferential direction of the tire to the extent of about 20% stretch is greater than about 40 kg/cm 2 and is in a range of between about 2.0 and about 6.0 times as high as the modulus of elasticity of said bead filler measured under tension in the radial direction of the tire to the extent of about 20% stretch.
Claim 7
Dependent Claim
23 words
A tire according to claim 4, wherein at least a portion of said short fiber grafts to said rubber component via a novolak.
Claim 8
Dependent Claim
23 words
A tire according to claim 4, wherein said rubber composition comprises from about 25 to 60 parts by weight of said short fiber.
Claim 9
Dependent Claim
16 words
A tire according to claim 4, wherein the material of said short fiber filaments comprises nylon.
Claim 10
Dependent Claim
66 words
A tire according to claim 4, wherein the modulus of elasticity of each bead filler measured under tension in the circumferential direction of the tire to the extent of about 20% stretch is at least about 3 times as high as the modulus of elasticity of said bead filler measured under tension in the radial direction of the tire to the extent of about 20% stretch.
Claim 11
Dependent Claim
24 words
A tire according to claim 4, wherein said short fiber filaments have lengths in a range from about 1 μm to about 100 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |